Based on literatures, its nice to invest on crypto because the return of investment is high. However, it depends on its supply and demand. Other than that, price of crypto fluctuates from time to time. So it means that there will be a time that you will get a high profit and sometimes negative.
So before entering on this type of investment, read a lot.. study how it goes so that you wont regret at the end. Investing is like a gamble. Its either you win or you lose.
I think that long term investment is sure to get a good return, but this only happens when you invest in coins that have high popularity and are at the top of CMC. This is a safe game if you say investment is like gambling, because when you only choose the top coin, the price will definitely increase in the future if you buy it in a bearish period.
Crypto are the future and the investment in this earns you are investing for the future which will give you the returns which no other asset class could give you. You would have to do research and according have to invest in the coins which will have a future demand.